Original 1st printing 8&1/2 x 11" boxing-style concert flyer for "Let's Go Tripping", a multi-act show featuring the Hedds, Baytovens, Intruders, Illusions and (the) Friendly Stranger(s), held at California Hall in San Francisco, CA on 4/9/1966.
Designer unknown (show was promoted by "A.K.P. Productions"), image is featured in the Art of Rock book on page 174 (plate 2.142).
Thin flat stock flyer is in very good to excellent (B/B+ to B+) condition; a touch of handling wear/light creasing, a pair of flattened horizontal/vertical folds, a couple of tiny pin-prick spots in the lower right quadrant and a bit of pen scratch on the reverse (someone's address, it barely bleeds through to the front right around where it says "Presents") and a stray tiny edge ding or two, otherwise fine.
Very weird oddball San Francisco psychedelic-era concert flyer from the AOR book. This show was held right around the same time as the first Bill Graham/Family Dog concerts... REALLY early piece.